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Physics > Applied Physics
Title: Probing the Role of Low Temperature Vacuum Baking on Photon Lifetimes in Superconducting Niobium 3-D Resonators
(Submitted on 30 Aug 2021 (this version), latest version 24 Apr 2024 (v3))
Abstract: We discuss a potentially dramatic source of quantum decoherence in three-dimensional niobium superconducting resonators and in two-dimensional transmon qubits that utilize oxidized niobium: an aggravation of two-level system (TLS) induced losses driven by vacuum baking at temperatures and durations typically used in transmon qubit fabrication. By coupling RF measurements on cavities with time-of-flight secondary ion mass spectrometry studies on an SRF cavity cutout, we find that modest vacuum baking (150-200~$^{\circ}$C for 5~min-11~hrs) produces a partially depleted native niobium oxide which likely contains a large concentration of oxygen vacancies that drive TLS losses. Continued baking is found to eliminate this depleted layer and mediate these additional losses.
Submission history
From: Daniel Bafia [view email][v1] Mon, 30 Aug 2021 16:24:07 GMT (461kb,D)
[v2] Thu, 25 Aug 2022 21:33:23 GMT (479kb,D)
[v3] Wed, 24 Apr 2024 21:03:06 GMT (621kb,D)
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